电路分析第1章2（Circuit analysis first chapters 2）.docVIP

电路分析第1章2（Circuit analysis first chapters 2） This article is contributed by hesefenmo DOC documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. Chapter 1 (2/3) circuit variables The first chapter: the overview of the lumped circuit variable hypothesis; the first section outlines: lumped lumped hypothesis; hypothesis; condition; lumped element circuit variable charge; voltage; section second: circuit variable charge; voltage; current; reference section second circuit related variable 5, power and energy Power and Energy, power: Power: energy change rate DW p= DT Power direction: energy flow (transmission) power: energy flow direction (transmission) of the flow into the trend: element (absorption power) into components (power absorption) outflow element (release power) outflow element (release power) 1 / 22 Chapter 1 (2/3) circuit variables DW u= udq DQ DW DQ = DW = p= =u = UI DT DT The use of type, should pay attention to: the use of reference direction, the need to pay attention to the reference direction: the direction of association, if u, I direction associated with P = UI direction of association, if u is not associated with P = I, UI? Judging power direction: judging power direction: if the computing power is that if the calculated power absorbing circuit is that circuit power absorption (or storage into heat). The power received (stored or converted to heat), if the calculated power is negative, indicates that the circuit is generated if the calculated power is negative, indicating that the circuit generates power (chemical energy is converted to electricity). Raw power (chemical energy into electrical energy): in the association under the direction of time and energy in association under the direction of t0 to the T1 time to absorb or release energy: circuit to absorb or release energy circuit: W (T0, T1) = P (x) formula D zeta = formula U (E) I (E) d. T0 t0 2 / 22 T1